Gas cylinders - Residual pressure valves - General requirements and type testing (ISO 15996:2005)

ISO 15996:2005 specifies requirements for residual pressure valves, with or without a non-return function, for gas cylinders and the methods of testing such valves, for type approval.
ISO 15996:2005 is applicable to valves to be fitted to gas cylinders of up to 150 l water capacity, intended to contain compressed, liquefied or dissolved gases.
ISO 15996:2005 does not cover valves for fire extinguishers, cryogenic equipment or liquefied petroleum gas.

Gasflaschen - Restdruckventile - Allgemeine Anforderungen und Typprüfung (ISO 15996:2005)

Diese Internationale Norm enthält Anforderungen an Restdruckventile, mit oder ohne Rückschlagfunktion, für Gasflaschen und Prüfverfahren zur Prüfung dieser Ventile für die Typzulassung.
Diese Internationale Norm gilt für Ventile an Gasflaschen mit einem Fassungsraum bis zu 150 Liter, die für verdichtete, verflüssigte und beständige Gase vorgesehen sind.
Diese Internationale Norm gilt nicht für Ventile an Feuerlöschern, für die Ausrüstung im Kryo-Bereich und für Flüssiggas.
Diese Anforderungen gelten zusätzlich zu den in ISO 10297 festgelegten Angaben.

Bouteilles à gaz - Robinets à pression résiduelle - Exigences générales et essais de type (ISO 15996:2005)

L'ISO 15996:2005 spécifie les exigences applicables aux robinets à pression résiduelle montés sur les bouteilles à gaz, avec ou sans dispositif antiretour, ainsi que les méthodes d'essai de ces robinets en vue de l'approbation de type.
L'ISO 15996:2005 est applicable aux robinets à monter sur les bouteilles à gaz de capacité en eau ne dépassant pas 150 l, destinées à contenir des gaz comprimés, liquéfiés ou dissous.
L'ISO 15996:2005 ne traite pas des robinets pour extincteurs d'incendie, équipements cryogéniques ou gaz de pétrole liquéfié.

Plinske jeklenke - Ventili z ostankom tlaka - Splošne zahteve in preskus tipa (ISO 15996:2005)

General Information

Status
Withdrawn
Publication Date
31-Mar-2005
Withdrawal Date
05-Sep-2017
Current Stage
9960 - Withdrawal effective - Withdrawal
Completion Date
06-Sep-2017

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SLOVENSKI STANDARD
SIST EN ISO 15996:2005
01-julij-2005

Plinske jeklenke - Ventili z ostankom tlaka - Splošne zahteve in preskus tipa (ISO

15996:2005)

Gas cylinders - Residual pressure valves - General requirements and type testing (ISO

15996:2005)
Gasflaschen - Restdruckventile - Allgemeine Anforderungen und Typprüfung (ISO
15996:2005)

Bouteilles a gaz - Robinets a pression résiduelle - Exigences générales et essais de type

(ISO 15996:2005)
Ta slovenski standard je istoveten z: EN ISO 15996:2005
ICS:
23.020.35 Plinske jeklenke Gas cylinders
23.060.40 7ODþQLUHJXODWRUML Pressure regulators
SIST EN ISO 15996:2005 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 15996:2005
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SIST EN ISO 15996:2005
EUROPEAN STANDARD
EN ISO 15996
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2005
ICS 23.020.30
English version
Gas cylinders - Residual pressure valves - General
requirements and type testing (ISO 15996:2005)

Bouteilles à gaz - Robinets à pression résiduelle - Gasflaschen - Restdruckventile - Allgemeine

Exigences générales et essais de type (ISO 15996:2005) Anforderungen und Typprüfung (ISO 15996:2005)

This European Standard was approved by CEN on 21 March 2005.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European

Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national

standards may be obtained on application to the Central Secretariat or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official

versions.

CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,

Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,

Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15996:2005: E

worldwide for CEN national Members.
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SIST EN ISO 15996:2005
EN ISO 15996:2005 (E)
Foreword

This document (EN ISO 15996:2005) has been prepared by Technical Committee ISO/TC 58

"Gas cylinders" in collaboration with Technical Committee CEN/TC 23 "Transportable gas

cylinders", the secretariat of which is held by BSI.

This European Standard shall be given the status of a national standard, either by publication of

an identical text or by endorsement, at the latest by October 2005, and conflicting national

standards shall be withdrawn at the latest by October 2005.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of

the following countries are bound to implement this European Standard: Austria, Belgium,

Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,

Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,

Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Endorsement notice

The text of ISO 15996:2005 has been approved by CEN as EN ISO 15996:2005 without any

modifications.
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SIST EN ISO 15996:2005
INTERNATIONAL ISO
STANDARD 15996
First edition
2005-04-01
Gas cylinders — Residual pressure
valves — General requirements and type
testing
Bouteilles à gaz — Robinets à pression résiduelle — Exigences
générales et essais de type
Reference number
ISO 15996:2005(E)
ISO 2005
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SIST EN ISO 15996:2005
ISO 15996:2005(E)
PDF disclaimer

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© ISO 2004

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Published in Switzerland
ii © ISO 2005 – All rights reserved
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SIST EN ISO 15996:2005
ISO 15996:2005(E)
Contents Page

Foreword............................................................................................................................................................ iv

Introduction ........................................................................................................................................................ v

1 Scope...................................................................................................................................................... 1

2 Normative references........................................................................................................................... 1

3 Terms and definitions........................................................................................................................... 1

4 Valve requirements............................................................................................................................... 2

4.1 General................................................................................................................................................... 2

4.2 Description............................................................................................................................................. 2

4.3 Valve outlet geometry........................................................................................................................... 2

4.4 Performance requirements of the residual pressure device............................................................ 3

4.4.1 Leakage tightness................................................................................................................................. 3

4.4.2 Endurance.............................................................................................................................................. 3

4.4.3 Resistance against reverse over pressure......................................................................................... 3

4.4.4 Resistance to ignition........................................................................................................................... 3

5 Type testing........................................................................................................................................... 3

5.1 General................................................................................................................................................... 3

5.2 Documents............................................................................................................................................. 4

5.3 Test valves............................................................................................................................................. 4

5.4 Residual pressure device performance tests .................................................................................... 5

5.4.1 General................................................................................................................................................... 5

5.4.2 Leak tightness tests.............................................................................................................................. 5

5.4.3 Cycle life test ......................................................................................................................................... 5

5.4.4 Resistance test against reverse over-pressure ................................................................................. 5

5.4.5 Oxygen pressure surge test................................................................................................................. 5

5.5 Test report.............................................................................................................................................. 6

Annex A (informative) Various examples of residual pressure valve designs ............................................ 7

Annex B (informative) Test equipment........................................................................................................... 10

B.1 Tightness test equipment for residual pressure valve ................................................................... 10

B.2 Cycle life test equipment for residual pressure valve..................................................................... 11

Annex C (informative) Conveyance test......................................................................................................... 12

Annex D (informative) Integrity under high flow ........................................................................................... 13

Bibliography ..................................................................................................................................................... 15

© ISO 2005 – All rights reserved iii
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SIST EN ISO 15996:2005
ISO 15996:2005(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies

(ISO member bodies). The work of preparing International Standards is normally carried out through ISO

technical committees. Each member body interested in a subject for which a technical committee has been

established has the right to be represented on that committee. International organizations, governmental and

non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the

International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 15996 was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 2, Cylinder

fittings.
iv © ISO 2005 – All rights reserved
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SIST EN ISO 15996:2005
ISO 15996:2005(E)
Introduction

Gas cylinders are fitted with valves, to contain and control the discharge of their contents.

Increased requirements about avoidance of contamination of gases and gas cylinders has led to the

development of gas cylinder valves incorporating residual pressure devices.

These devices are designed to maintain a small positive differential pressure between the inlet and the outlet

of the cylinder valve. This prevents the gas cylinder from being completely empty in customer use and stops

ingress of atmospheric contamination.

Many of these devices include a non-return function that protects the cylinder from back flow from

downstream processes.
© ISO 2005 – All rights reserved v
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SIST EN ISO 15996:2005
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SIST EN ISO 15996:2005
INTERNATIONAL STANDARD ISO 15996:2005(E)
Gas cylinders — Residual pressure valves — General
requirements and type testing
1 Scope

This International Standard specifies requirements for residual pressure valves, with or without a non-return

function, for gas cylinders and the methods of testing such valves, for type approval.

This International Standard is applicable to valves to be fitted to gas cylinders of up to 150 l water capacity,

intended to contain compressed, liquefied or dissolved gases.

This International Standard does not cover valves for fire extinguishers, cryogenic equipment or liquefied

petroleum gas.
These requirements are in addition to those laid down in ISO 10297.
2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.

ISO 10156, Gases and gas mixtures — Determination of fire potential and oxidizing ability for the selection of

cylinder valve outlets

ISO 10297:1999, Gas cylinders — Refillable gas cylinder valves — Specification and type testing.

3 Terms and definitions
For the purposes of this document the following terms and definitions apply.
3.1
working pressure
settled pressure, at a uniform temperature of 15 °C, for a full gas cylinder
3.2
valve test pressure

for compressed gases p = 1,2 × p and for liquefied gases and dissolved gases under pressure

vt w

(e.g. acetylene), p is greater or equal to the minimum test pressure of the cylinder quoted in the relevant

transportation regulation for that gas or gas group and filling ratio
3.3
flow direction

path taken through the valve by the gas when flowing out of the cylinder through the outlet

© ISO 2005 – All rights reserved 1
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SIST EN ISO 15996:2005
ISO 15996:2005(E)
3.4
filling direction

path taken through the valve by the gas when filling from the outlet into the gas cylinder

3.5
opening pressure

differential pressure between upstream and downstream pressures at which the residual pressure device

starts to open

NOTE Due to the effects of manufacturing tolerances this is normally expressed as a range of pressures.

3.6
closing off pressure

differential pressure between upstream and downstream pressures at which the residual pressure device

closes

NOTE Due to the effects of manufacturing tolerances this is normally expressed as a range of pressures.

4 Valve requirements
4.1 General

Valves shall operate satisfactorily over the full range of service temperatures, normally from − 20 °C to + 65 °C.

The range may be exceeded for short periods (e.g. during filling). Where higher or lower service temperatures

are required for longer periods, the purchaser shall specify them accordingly.

Valves shall be capable of withstanding the mechanical stresses or chemical attack they may experience

during normal service e.g. during storage, valving into cylinders, filling processes, transportation and end use

of the cylinder.

Valves shall be cleaned to meet the requirements of the intended service. However, valves to be tested shall

be in a condition that the manufacturer intends to supply, prior to any test or test preparation.

4.2 Description

There are currently two main types of residual pressure valves (see Figures A.1 and A.2). The valve shown in

Figure A.1 leaves a small positive or residual pressure in the cylinder. The valve shown in Figure A.2 not on

...

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